突变MAPT 在细胞模型中诱导rDNA转录过活化和核细胞应激
Zaid Muhammad1,2, Yan Gu2, Suleiman H Kwairanga1,2
1Sussex Neuroscience, School of Life Sciences, University of Sussex, Brighton, UK.
Research square
|November 19, 2025
概括
突变的蛋白积聚在细胞核中,增加其活性,导致细胞死亡. 这种核细胞功能障碍有助于前性痴呆症 (FTD) 中的神经毒性.
科学领域:
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
- 遗传学 遗传学 是一个
背景情况:
- 陶蛋白传统上与微管稳定有关,其病理聚合是神经退行性陶病症的核心,如阿尔茨海默病 (AD) 和前性痴呆症 (FTD).
- 新出现的证据表明参与了核和核细胞功能,但病理对核细胞功能的影响尚不清楚.
研究的目的:
- 研究蛋白在细胞核中的定位和功能后果,特别是在疾病相关突变的背景下.
- 确定突变的tau表达是否影响核细胞结构,活性和稳态,以及它与神经毒性的关系.
主要方法:
- 免疫光显微镜可视化分化SH-SY5Y细胞和诱导多能干细胞 (iPSC) 衍生神经元中的局部.
- 高含量成像和定量PCR (qPCR) 用于评估核细胞结构,标记物表达和rDNA转录.
- 核细胞RNA选择性染料染色和对亡标记物的评估 (p53,caspase 3/7,TUNEL测定).
主要成果:
- 陶蛋白定位在细胞核中,并在与疾病相关的MAPT突变 (P301S,S305N,IVS 10 + 16) 的表达时积聚.
- 突变的tau表达导致核细胞和核扩张,对关键的核细胞标记物进行上调,并增加rDNA转录和rRNA处理,表明核细胞活性升高.
- 这种核细胞过度激活与核细胞压力,p53稳定,卡斯巴酶激活和亡的迹象有关.
结论:
- 突变的表达导致显著的核细胞功能障碍和核细胞平衡的破坏.
- 核细胞功能障碍被确定为突变性tau积累的下游后果.
- 核细胞平衡的破坏可能是MAPT相关FTD中观察到的tau介导神经毒性的关键因素.
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